Fumulus, the Infestation

a Slug attacks — 62 cards in the game can cause this.

1. Bloodline Pretender — When Bloodline Pretender attacks, Fumulus, the Infestation makes each opponent lose 1 life
2. Barkform Harvester — When Barkform Harvester attacks, Fumulus, the Infestation makes each opponent lose 1 life
3. Graveshifter — When Graveshifter attacks, Fumulus, the Infestation makes each opponent lose 1 life
4. Three Tree Mascot — When Three Tree Mascot attacks, Fumulus, the Infestation makes each opponent lose 1 life
5. Universal Automaton — When Universal Automaton attacks, Fumulus, the Infestation makes each opponent lose 1 life
6. Rooftop Percher — When Rooftop Percher attacks, Fumulus, the Infestation makes each opponent lose 1 life
7. Changeling Wayfinder — When Changeling Wayfinder attacks, Fumulus, the Infestation makes each opponent lose 1 life
8. Ghostly Changeling — When Ghostly Changeling attacks, Fumulus, the Infestation makes each opponent lose 1 life
9. Moonglove Changeling — When Moonglove Changeling attacks, Fumulus, the Infestation makes each opponent lose 1 life
10. Skeletal Changeling — When Skeletal Changeling attacks, Fumulus, the Infestation makes each opponent lose 1 life

52 other cards cause it too. These are the ones with the most connections.

an Insect attacks — 323 cards in the game can cause this.

1. Vrestin, Menoptra Leader — When Fumulus, the Infestation attacks, Vrestin, Menoptra Leader puts a counter on a permanent
2. Nantuko Husk — When Nantuko Husk attacks, Fumulus, the Infestation makes each opponent lose 1 life
3. Dross Hopper — When Dross Hopper attacks, Fumulus, the Infestation makes each opponent lose 1 life
4. Devouring Swarm — When Devouring Swarm attacks, Fumulus, the Infestation makes each opponent lose 1 life
5. Chitin Gravestalker — When Chitin Gravestalker attacks, Fumulus, the Infestation makes each opponent lose 1 life
6. Necrosquito — When Necrosquito attacks, Fumulus, the Infestation makes each opponent lose 1 life
7. Swarm of Bloodflies — When Swarm of Bloodflies attacks, Fumulus, the Infestation makes each opponent lose 1 life
8. Great Fierce Bee — When Great Fierce Bee attacks, Fumulus, the Infestation makes each opponent lose 1 life
9. Huskburster Swarm — When Huskburster Swarm attacks, Fumulus, the Infestation makes each opponent lose 1 life
10. Comet Crawler — When Comet Crawler attacks, Fumulus, the Infestation makes each opponent lose 1 life
11. Buzzard-Wasp Colony — When Buzzard-Wasp Colony attacks, Fumulus, the Infestation makes each opponent lose 1 life

85 other cards care about it too. These are the ones with the most connections.

a Vampire attacks — 484 cards in the game can cause this (Fumulus is one).

When Fumulus, the Infestation attacks:

1. Glass-Cast Heart — makes a token
2. Sanctum Seeker — makes each opponent lose 1 life

a nontoken Vampire attacks — 484 cards in the game can cause this (Fumulus is one).

1. Mavren Fein, Dusk Apostle — When Fumulus, the Infestation attacks, Mavren Fein, Dusk Apostle makes a token

a Vampire creature is cast — 484 cards in the game can cause this (Fumulus is one).

1. Bloodlord of Vaasgoth — When Fumulus, the Infestation is cast, Bloodlord of Vaasgoth grants bloodthirst

a Vampire deals combat damage — 484 cards in the game can cause this (Fumulus is one).

When Fumulus, the Infestation deals combat damage:

1. Rakish Heir — puts a counter on a permanent
2. Stensia Masquerade — puts a counter on a permanent

a Vampire enters the battlefield — 500 cards in the game can cause this (Fumulus is one).

When Fumulus, the Infestation enters:

1. Anje, Maid of Dishonor — makes a token
2. Forerunner of the Legion — gives +1/+1
3. Markov Enforcer — deals damage
4. Evelyn, the Covetous — exiles a card from a library

sacrifice a nontoken creature — 1,714 cards in the game can cause this.

1. Ayara, First of Locthwain — When you sacrifice another black creature to Ayara, First of Locthwain, Fumulus, the Infestation makes a token
2. Foot Chopper — When a creature is sacrificed thanks to Foot Chopper, Fumulus, the Infestation makes a token
3. Blasting Station — When you sacrifice a creature to Blasting Station, Fumulus, the Infestation makes a token
4. Tainted Aether — When a creature is sacrificed thanks to Tainted Aether, Fumulus, the Infestation makes a token
5. Saw — When a creature is sacrificed thanks to Saw, Fumulus, the Infestation makes a token
6. Sporogenic Infection — When a creature is sacrificed thanks to Sporogenic Infection, Fumulus, the Infestation makes a token
7. Endrek Sahr, Master Breeder — When you sacrifice Endrek Sahr, Master Breeder, Fumulus, the Infestation makes a token
8. Skittering Horror — When you sacrifice Skittering Horror, Fumulus, the Infestation makes a token
9. Skittering Skirge — When you sacrifice Skittering Skirge, Fumulus, the Infestation makes a token
10. Skittering Monstrosity — When you sacrifice Skittering Monstrosity, Fumulus, the Infestation makes a token

1,704 other cards cause it too. These are the ones with the most connections.

life is gained — 2,076 cards in the game can cause this (Fumulus is one).

When Fumulus, the Infestation gains life:

1. Dina, Soul Steeper — makes each opponent lose 1 life
2. Marina Vendrell's Grimoire — draws you that many cards
3. South Wind Avatar — makes each opponent lose 1 life
4. Rodolf Duskbringer — grants indestructible
5. Fiendish Panda — puts a +1/+1 counter on itself
6. Veinwitch Coven — brings a card back
7. Cleric Class — puts a counter on a creature
8. Lich's Mastery — draws you that many cards
9. Wall of Limbs — puts a +1/+1 counter on itself
10. Ratchet, Field Medic // Ratchet, Rescue Racer — triggers

84 other cards care about it too. These are the ones with the most connections.

a creature token enters the battlefield — 2,799 cards in the game can cause this (Fumulus is one).

When an Insect enters thanks to Fumulus, the Infestation:

1. Securitron Squadron — puts a counter on a permanent
2. Anointer Priest — gains you 1 life
3. Nesting Dovehawk — puts a +1/+1 counter on itself

a creature token is created — 2,799 cards in the game can cause this (Fumulus is one).

1. Staff of the Storyteller — When Fumulus, the Infestation makes an Insect token, Staff of the Storyteller puts a story counter on itself

3 other cards care about it too. These are the ones with the most connections.

life is lost — 3,160 cards in the game can cause this (Fumulus is one).

When a permanent makes a player lose life thanks to Fumulus, the Infestation:

1. Far Fortune, End Boss — raises your speed
2. Zahur, Glory's Past — raises your speed
3. Mendicant Core, Guidelight — raises your speed
4. Aether Syphon — raises your speed
5. Vnwxt, Verbose Host — raises your speed
6. Embalmed Ascendant — raises your speed
7. Slick Imitator — raises your speed
8. Nesting Bot — raises your speed
9. Howlsquad Heavy — raises your speed
10. Hour of Victory — raises your speed

46 other cards care about it too. These are the ones with the most connections.

a token enters the battlefield — 3,710 cards in the game can cause this (Fumulus is one).

When an Insect enters thanks to Fumulus, the Infestation:

1. Baron Bertram Graywater — makes a token
2. Marneus Calgar — draws you 1 card
3. Belladonna Took — gains you 1 life
4. Kambal, Profiteering Mayor — makes a token
5. Lucy MacLean, Positively Armed — makes a token
6. Mister Fantastic, Reed Richards — draws you 1 card
7. Cloakwood Swarmkeeper — puts a +1/+1 counter on itself
8. Woodland Champion — puts that many +1/+1 counters on itself
9. Leonardo, the Balance — puts a counter on a creature
10. Spiritcall Enthusiast // Scrollboost — becomes prepared

3 other cards care about it too. These are the ones with the most connections.

a token is created — 3,711 cards in the game can cause this (Fumulus is one).

When Fumulus, the Infestation makes an Insect token:

1. Akim, the Soaring Wind — makes a token
2. Idol of Oblivion — draws you 1 card
3. Rosie Cotton of South Lane — puts a counter on a permanent
4. Mirkwood Bats — makes each opponent lose 1 life

17 other cards care about it too. These are the ones with the most connections.

anything attacks — 17,934 cards in the game can cause this (Fumulus is one).

When Fumulus, the Infestation attacks:

1. Temmet, Naktamun's Will — draws you 1 card
2. Invisible Woman — triggers
3. Caesar, Legion's Emperor — sacrifices a creature
4. Guide of Souls — triggers

133 other cards care about it too. These are the ones with the most connections.

a creature attacks — 17,934 cards in the game can cause this (Fumulus is one).

1. Adaptive Omnitool — When Fumulus, the Infestation attacks, Adaptive Omnitool searches a library

203 other cards care about it too. These are the ones with the most connections.

a creature enters the battlefield — 19,800 cards in the game can cause this (Fumulus is one).

1. Slash, Reptile Rampager — When an Insect enters thanks to Fumulus, the Infestation, Slash, Reptile Rampager deals 2 damage
2. Gimli of the Glittering Caves — When Fumulus, the Infestation enters, Gimli of the Glittering Caves puts counters on a permanent
3. Ray Fillet, Wave Warrior — When Fumulus, the Infestation enters, Ray Fillet, Wave Warrior puts a counter on itself
4. Legolas Greenleaf — When Fumulus, the Infestation enters, Legolas Greenleaf puts a counter on a permanent
5. Aetherstorm Roc — When an Insect enters thanks to Fumulus, the Infestation, Aetherstorm Roc puts a counter on a permanent you control

346 other cards care about it too. These are the ones with the most connections.

anything enters the battlefield — 26,499 cards in the game can cause this (Fumulus is one).

1. Prowl, Stoic Strategist // Prowl, Pursuit Vehicle — When an Insect enters thanks to Fumulus, the Infestation, Prowl, Stoic Strategist // Prowl, Pursuit Vehicle puts a +1/+1 counter on itself

58 other cards care about it too. These are the ones with the most connections.